<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form>
        <!-- 输入框 -->
        <input type="text" placeholder="请输入用户名">
        <!-- 密码框 -->
        <input type="password" placeholder="请输入密码">
        <!-- 按钮 -->
        <input type="submit" value="提交">
        <!-- 数字框 -->
        <input type="number" placeholder="请输入数字">
        <!-- 搜索框 -->
        <input type="search" placeholder="请输入搜索内容">
        <!-- 文件上传框 -->
        <input type="file" placeholder="请选择文件">
        <!-- 多选按钮 -->
        <input type="checkbox">
        <!-- 单选按钮 -->
        <input type="radio" name="age">
        <input type="radio" name="age">

    </form>
    
</body>
</html>